package com.itheima.config;

import com.itheima.common.JacksonObjectMapper;
import java.util.List;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Slf4j
@Configuration
public class WebMvcConfig implements WebMvcConfigurer {
    
    /**
     *  静态资源未在static或template目录下
     *  设置静态资源映射
     * @param registry
     */
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        log.info("开始进行静态资源映射...");
        //registry.addResourceHandler("/static/backend/**").addResourceLocations("classpath:/static/backend");
        //registry.addResourceHandler("/static/front/**").addResourceLocations("classpath:/static/front");
        registry.addResourceHandler("/favicon.ico").addResourceLocations("/favicon.ico");

    }

    /**
     * 扩展mvc框架的消息转换器
     * @param converters
     */
    @Override
    public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
        log.info("扩展消息转换器...");

        //创建消息转换器对象
        MappingJackson2HttpMessageConverter messageConverter = new MappingJackson2HttpMessageConverter();
        //设置对象转换器，底层使用Jackson将Java对象转为json
        messageConverter.setObjectMapper(new JacksonObjectMapper());
        //将上面的消息转换器对象追加到mvc框架的转换器集合中
        converters.add(0,messageConverter);
                      //  索引值0 让我们设置的转换器优先使用
    }
}
